Antiskidding device for tires.



M. C. HARRIS.

ANTISKIDDING DEVICE FOR TIRES.

APPLICATION FILED MAY 22, 1912.

1,05 3,504. v Patented Feb. 18, 1913.

mm 82% M 'l-fi eZa-Harrzls vwoofm 2/ e0 2 V 1 I V I i e 4 UNTTE MICHAEL C. HARRIS, PHILADELPHIA, PENNSYLVANIA.

ANTISKIDDING DEVICE FOR TIRES.

Specification of Letters Patent.

llal entetl Feb. its. 1913,

Application filed May 22, 1912. Serial No. 698.949.

To all '(C/LUHZ 1'! may concern Be it known that l, illlfHAlCL (f. llamas. a citizen of the inited States. residing at Philadelphia. in the county of Philadelphia and State of Pennsylvania, have invented certain new and use't'ul In'iprovements in itntiskiddiug Devices for Tires, of which the following is a speti-itication.

My invention relates to improvements in antiskidding' devices for tires, the object of the invention heing to provide an improved attachment of this character which may he readily placed in position on a tire, and removed therefrom. and which is especially designed for use in connection with solid tires upon heavy trucks and drays, yet which adapted for use in eonnectioi'i with any fo m of tire.

A further ohjeet is to provide an improved circular series ot levers havin; intern'iediate ground contacting portions of general V-shape which insure a gripping action as the wheel revolves, and which prevent skidding, and so connect the several levers that the pressure on one acts to bind the others, and insure a firm hold on the tire.

\Vith these and other ohjects in view, the invention consists in certain novel features of construction and combinations and ar rangements ot' parts. as will he more fully hereina't'ter described and pointed out in the claim.

In the accompanying drawings: Figure l, is a view in side elevation illustrating my improvements in position on a wheel. Fig. 2, is an edge view of Fig. Fig. 23, is a perspective view o't one of the levers. Fig.

-'l,-is an enlarged view in cross section illustrating the manner of loekinp the clamping lever. Fig. 5, 1s a view 111 side elevation on w an. enlarged scale of one ot the lever connecting' links and Fig. (3, is a view in section on the line 6--t3 of Fi e F.

1 represents a wheel. 2 the telly thereon, and 3 the rim on which a rubber tire t is located. The particular tire indicated is of the heavy solid ruloloer type, designei l primarily for use in connection with heavy drays and trucks. and this form of tire has a flat grooved periphery as clearly shown in Fi 2.

Around the tire, I locate my improved anti-skidding device which comprises a circular series (it levers ()ne of these levers is shown in perspective in Fig. 3, where it, will be seen that each lever comprises-a strip of sheet metal which is bent intermediate its ends forming a tlat V-shaped ground engaging portion H The ends of the strip then extend beside the tire and t'elly in a radial direction as shown at 7. and then curve substantially (,:oneentric with the curvature ot the wheel. These curved portions, for purposes of description I shall term arms Fl. and these arms at their free ends are provided with openings t) for the reception of links it) connecting said rear ends with the adjacent levers at the forward ends of the latter where said levers are pro vided with openings 11. In other words. the parallel arms at the sides of the wheel ,are provided with two openings 5) and 11.

so that the said levers may be connected with adjacent levers hy the links '10. The arms of one of the levers is preferably shorter as shown at til. and these shorter arms are connected by chains ll with lockin; levers 15 on the adjacent lever By this arrangement the ground eoiitaeting V- shapedportions ii of all of the levers are arranged an approximate equi-distan .-e apart, yet the flexible chains H allow ot' a predetermined amount of adjustment in order to securely clamp the device upon various sizes of wheel.

The levers 15 above referred to are connected by links 10 with their lever 5, and For purposes of distinguishing these locking levers from the other levers, I shall term the first-mentioned levers ground engaging; levers. The locking lovers are projected through links of chains .l-l, and are then t'ulerumed with their free ends pressed toward the ground engagihelever 5. Links 17, as shown most clearly in Fig. l, are provided on the arms 8 of the ground engaging lever 5 with which locking levers '15 are connected. and it will he seen that these links 17 have a lateral oil-set portion 1.8 which may be readily slid onto the locking; levers .15. when the latter are at. one side of the arms h. When the locking levers are thus positioned they may he forced laterally over lugs 18 in link 17, and positioned between the edge ot tl arms 8 and the ends ot the links, and securely held against accidental movenurnt. The pressure applied to the anti-skidding device by the locking levers '15 is determined by the links of chains l-jl through which levers 1.5 are projected.

reference to Fig. 3, it will be seen that the V-shaped ground engaging' portion slipping on the tire.

of the ground engaging levers 5 extends rearwardly' in a direction of the free ends of the arms 8, hence when these ground engaging portions .6 are forced upwardly byreason of the Weight of the vehicle there on, the levers or arms 8 are caused to fulcrum ,moving their free ends inwardly. This movement tends to draw inwardly the ground engaging portions of all of the levers, so that the tire is firmly gripped and there is no possibility of the attachment Furthermore. the V- shaped ground engaging portions of the links grip the ground, so that the wheel does not slip but readily propels the vehicle,

and the angular formation of these round engaging portions prevent any side-"Wise slipping or skidding movement.

The device may detached as above described by moving the links 17 and locking levers 15.

The links 10, as shown most clearly in Figs. 5 andti. each comprise two sheet metal blanks open at one side, as shown at 20, and these links are oppositely positioned and securedtogether by rivets 21. This enables the links to be assembled on the levers and readily secured by the links.

To prevent. any lateral movement of the link members relative to each. other, said links have their engaging faces at their ends "formed with interlocking lugs and recesses be quickly attaehed and.

l l l l l l 1 engagement prevents any possibility of,

shearing" the rivets and insures a strong 'dn rable structure.

Various slight changes might be made in the general form and arrangement of parts described Without departing from my invention, and hence I do not limit myself to the precise n'ryself at liberty to make such changes and alterations as fairly fall within. the spirit and scope oi the appended claim.

Having thus described. my invention, what I claim as new and desire to secure by lielters Patent is:

in. anti skidding device,comprising a cir- (-ular series oi levers each lever projected rcarxi 'ardly betn'een its ends in general V- ehape the ends of each lever extendinghe side both. tires radially for a relatively short distance, and then curring; renirirardly concentrically with the axis of the Wheel, and links pivotally said levers at the sides of the tire, substantially' as described. 7 7

In testimony whereof l have signed my name to th .3 sp %g}lii(a.ii01i in the presence 0'? two subserihi as; witnesses.

lfitnesses Cnas. "13 'ET 1\ v v E. Torre,v Kenn KEL.

details setforth, but consider connecting; the ends of 5 

